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Title: Natural levees and human settlement in the Song Hong (Red River) delta, northern Vietnam
Authors: Vu Van Phai
Nguyen Hieu
Ayako Funabiki
Yoshiki Saito
Shigeko Haruyama
Keywords: accumulation rate;archaeological sites;delta;natural levees;sea-level change;shoreline change
Issue Date: 2012
Abstract: The Song Hong (Red River) delta, northern Vietnam, is characterized by huge natural levees in an area of the delta plain known as the West Floodplain where fluvial sedimentation predominates. The natural levees along the Day River, a major distributary of the Song Hong, are comparable in size with those of the main course of the Song Hong. The Day River levees are 3–8 km wide and rise 2–5 m above the adjacent backswamps and have played an important role in human settlements since the late Metal age. We discussed the relationships among the natural levees of the Day River, delta progradation and the distribution of archaeological sites on the delta plain. During the early Holocene, the accumulation of sediment discharged by the Song Hong enhanced both aggradation of the floodplain and river mouth progradation within the drowned valley of the Song Hong. Radiocarbon dates from cores, trench exposures, and archaeological sites record a dramatic slowing of aggradation when sea level stabilized during 6–4 cal. kyr BP (the Holocene sea-level highstand). As sea level fell to the present level during 4–0 cal. kyr BP, the river mouth prograded rapidly toward the Gulf of Bac Bo (Gulf of Tonkin) and the river channels extended seaward. In the West Floodplain, lateral accretion overtook vertical accretion to generate the present longitudinal profiles of the Song Hong and Day rivers. During this period, human settlements spread across the backswamp and Holocene terrace area, lagging around 2 kyr behind the shoreline migration.
Description: TNS06875; HOLOCENE Volume: 22 Issue: 6 Pages: 637-648 Published: JUN 2012
ISSN: 0959-6836
Appears in Collections:Bài báo của ĐHQGHN trong Web of Science

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